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authorBjorn Helgaas <bjorn.helgaas@hp.com>2010-12-16 17:39:02 (GMT)
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-12-17 18:01:30 (GMT)
commita2c606d53ab71dee6410f10ef0adf67321d60e06 (patch)
tree7a4cf519cbfc01fd1c4273c1481f40f4cd7d00bc /Documentation
parent4dc2287c1805e7fe8a7cb90bbcd44abee8cdb914 (diff)
downloadlinux-a2c606d53ab71dee6410f10ef0adf67321d60e06.tar.xz
x86: avoid high BIOS area when allocating address space
This prevents allocation of the last 2MB before 4GB. The experiment described here shows Windows 7 ignoring the last 1MB: https://bugzilla.kernel.org/show_bug.cgi?id=23542#c27 This patch ignores the top 2MB instead of just 1MB because H. Peter Anvin says "There will be ROM at the top of the 32-bit address space; it's a fact of the architecture, and on at least older systems it was common to have a shadow 1 MiB below." Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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